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2 years ago

-10a + -5 + -4a + -9 - 6a Help

Mathematics

2 answers:

zimovet [89]2 years ago

7 0

-20a-14

Combine like terms

Vlad [161]2 years ago

4 0

Answer: -20a - 14

Step-by-step explanation:

Given

-10a + -5 + -4a + -9 - 6a

Rephrase expression

-10a - 5 - 4a - 9 - 6a

Put like terms together

(-10a-4a-6a)-(5+9)

Combine like terms

-20a - 14

Hope this helps!! :)

Please let me know if you have any questions

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Listed below are pulse rates (beats per minute) from samples of adult males and females. Does there appear to be a difference

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Answer:

There appears to be a difference between the pulse rates from samples of adult males and females. The average pulse rate of males is 63.75 while that of females is 75.875.

Coefficient of Variation (male) = 33.44%

Coefficient of variation (female) = 28.35%

Step-by-step explanation:

Mean (male) = $\frac{sum of x}{n} =\frac{1020}{16} =63.75$

Mean (female) = $\frac{sum of y}{n} = \frac{1214}{16} = 75.875$

Standard Deviation (male) = $\sqrt{\frac{sum(x-63.75)^2}{16-1} } =21.315$

Standard Deviation (female) = $\sqrt{\frac{sum(y-75.875)^2}{16-1} } = 21.512$

Coefficient of Variation = $\frac{Std dev}{mean} *100$

For male, CV = $\frac{21.315}{63.75} *100=33.44%$ %

For female, CV = $\frac{21.512}{75.875} *100=28.35$ %

Comparison : Pulse rates of males has more variability than that of females since it has a greater coefficient of variation.

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Answer:

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